Hot air furnace



Feb. 15, 1938. B. B. w. COOPER HOT AIR FURNACE Filed Oct. 10, 1936 m a uu u a a a a1! a u a \a u u u u u u INVENTOR Barclay BJMCooper' I BY%ZATTO NEY Patented Feb. 15, 193av UNITED STATES PATENT OFFICE HOT AIRFURNACE Barclay B. W. Cooper, Oklahoma City, Okla.

Application October 10, 1936, Serial No. 105,038

3 Claims.

My invention relates to hot air furnaces, and

more particularly to a unit adapted to be suspended from the floor of aresidence to heat the same.

crease .the heating capacity without increasing the fuel consumption orsize.

Another object of my invention is to provide a floor furnaceconstruction of increased efliciency, compactness and one which issimple and inexpensive to manufacture.

Other and further objects of my invention will appear from the followingdescription and claims.

In the accompanying drawing, which forms part of the instantspecification and which is o be read in conjunction therewith, and inWhibfl like reference numerals are used to indicate like parts in thevarious views.

Fig. 1 is a sectional elevation of a floor furnace showing oneembodiment of my invention.

Fig. 2 is a sectional view taken on the line 2-2,

4. A combustion chamber is formed in one corner of the casing 4 by meansof a baflie 5. The construction is such that'an elongated opening 6 isformed by one edge of the baiiie with a side wall of the casing 4.

Any suitable gas or oil burner, as for example gas burner l, ispositioned to burn fuel in the combustion chamber 8, formed by thebaille 5 with the casing 4. Gas is furnished to the humor I through line9. The products of combustion discharge tangentially through the opening5 into the heat exchange chamber ill in which a plurality of inclinedheat exchange tubes II are positioned. The exterior of the casing 4 isprovided with a metal fluting l2, forming a plurality of flues I3 openat both ends. A duct 14 opens into the heat exchange chamber 10 andprovides communication between the heat exchange chamber and a' fluepipe, not shown. The heat exchange tubes II are closely spaced at theirlower ends and more widely spaced at their upperends, as can morereadily be seen by reference to Fig. 1. A flow baflie l5 is'carried bythe casing l in the vicinity of the air inlet to the heat exchange tubesll. The'corners of easing 4 are rounded at l6, l1 and II to provide asmooth wall for the whirling of the hot products of combustion which aretangentially discharged into the heat exchange chamber.

In operation, the burner I is' lighted and the combustion takes place inthe combustion chamber 8. The hot products of combustion aretangentially discharged from the' combustion chamber through the opening6, from the upper end of the combustion chamber. The volume of the hotproducts of combustion is such that some pressure is built up in thecombustion chamber, causing the hot products of combustion to flow witha whirling motion at considerable velocity. The casing 4 becomes heated,as do the tubes ll. Air from the room to be heated will drop downwardlythrough the annular space formed by casing I and casing 4. As the airpasses incontact with the exterior surfaces of the metal fiuting 12 itwill become heated and tend to rise. A portionof the air will risethrough the flues l3 formed by the side walls of the casing d and themetal fluting it. A large portion of the air will flow toward the loweropenings of the tubes it which are grouped. A mass flow of the air willbe caused to take place by reason of the grouping in close proximity ofthe openings of' the tubes l l. The air rising through the heated tubeswill be come heated by convection heat. The heated air rising throughthe tubes leaves them at their upper ends and passes through the grillllinto the room to be heated. The inclining of the tubes will tend toprevent stratification of the air flowing through them. It will bereadily appreciated that if a blanket of hot air adjacent the tube wallis permitted to form, the air in the center of the tube will bepartially insulated and less eflicient heat exchange will occur. Withthe tubes inclined the heated air will rise and permit further andcooler air to contact the hot tube wall. It will be observed that thelower walls of the tubes are outermost and will therefore be heated to ahigher temperature by the circulating combustion gases.

It will be seen that I have accomplished the objects of my invention. Ihave provided a simple and inexpensive floor furnace of compact designand efllcientconstruction. I am enabled to obtain great efliciency dueto the novel construction.

It will be understood that certain features and sub-combinations are ofutility and may be-employed without reference to other features andsub-combinations. This is contemplated by and is within the scope of myclaims. It is further obvious that various changes may be made indetails within the scope of my claims, without departing from the spiritof my invention. It is, therefore, to be understood that my invention isnot limited to the specific details shown and described.

Having thus described my invention, what I claim is:

1. In a hot air furnace, a housing, a casing positioned within saidhousing in spaced relation therewith to form an air heating passage,means in said casing dividing the same into a combustion chamber and aheat exchange chamber and cooperating with the side wall of said casingto provide a discharge of combustion gases tangentially of said wall ofthe casing to impart a whirling motion to the gases in said heatexchange chamber, a flue connection communicating with said heatexchange chamber at a point spaced from said discharge means along theaxis of whirling.

2. In a hot air furnace, a housing, a casing positioned within saidhousing in spaced relation with the side walls and bottom thereof toform side passages and a bottom. passage therewith, means in said casingdividing the same into a combustion chamber and a heat exchange chamberand cooperating with the side wall of said casing to provide a dischargeof combustion gems tangentially or said well of the casing to impart awhirling motion to the gases in said heat exchange chamber, a flueconnection communicating with said heat exchange chamber at a pointspaced from the discharge means along the axis of whirling, saidcasingbeing provided with metal fluting secured to the exterior thereofforming fines with the casing side walls.

, 3. In a hot air furnace, a housing, a casing positioned within saidhousing in spaced relation with the side walls and bottom thereof toform side passages and a bottom passage therewith, means in said casingdividing the same into a combustion chamber and a heat exchange chamberand cooperating with a side wall of said casing to provide a dischargeof combustion gases tangentially of said wall of the casing to impart awhirling motion to the gases in said heat exchange chamber, a flueconnection communicating with said heat exchange chamber at a pointspaced from the discharge means alon the axis of whirling, a heatexchange tube positioned within said heat exchange chamber, and a bafllein said lower passageway for directing air to be heated to the lower endof said heat exchange tube.

BARCLAY B. W. COOPER.

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